free5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri)

{
  "id": "a2f6b384b398fec1e9365e69d850c436f064794f04b2a63bc4e50ab87dc8cd65",
  "url": "https://osv.dev/vulnerability/CVE-2026-44319",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "free5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri)",
    "summary": "free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF terminates the entire process when a stored PFD-subscription notifyUri cannot be reached. In PfdChangeNotifier.FlushNotifications(), the notifier calls NnefPFDmanagementNotify(...) and on any delivery error invokes logger.PFDManageLog.Fatal(err), which is os.Exit(1)-equivalent in Go. An attacker who can create a PFD subscription with an attacker-chosen notifyUri and then trigger a PFD change can deterministically kill NEF on the asynchronous delivery attempt -- the process exits with status 1, dropping NEF's entire SBI surface until restart. This vulnerability is fixed in 4.2.2.",
    "evidence": "osv:CVE-2026-44319",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-44319",
      "aliases": [
        "CVE-2026-44319",
        "GHSA-rxrq-fv76-26pr",
        "GO-2026-5647"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/free5gc/free5gc",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "8b0f4445fc931638fb624463ce3572a203517679"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.2.2"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.2.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            },
            {
              "repo": "https://github.com/free5gc/nef",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "f110517b1189801950b50668a593398687049074"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "f110517b1189801950b50668a593398687049074"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v4.2.1",
            "v4.2.0",
            "v4.1.0",
            "v4.0.1",
            "v4.0.0",
            "v3.4.5",
            "v3.4.4",
            "v3.4.3",
            "v3.4.2",
            "v3.4.1",
            "v3.4.0",
            "v3.3.0",
            "v3.2.1",
            "v3.2.0",
            "v3.1.1",
            "v3.1.0",
            "v3.0.7",
            "v3.0.6",
            "v3.0.5",
            "v1.2.2",
            "v1.2.1",
            "v1.2.0",
            "v1.1.0",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44319.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.270413481Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44319.json",
        "https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44319",
        "https://github.com/free5gc/free5gc/issues/924",
        "https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074",
        "https://github.com/free5gc/nef/pull/25"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-20",
          "CWE-617",
          "CWE-755"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44319.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44319",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 491962,
  "published_at": "2026-05-27T15:49:20.934+00:00"
}